Example CMake project

[CsatiZoltan]

Hi,

If any of you have a CMake-based C++ application that uses t8code, could you please share the CMakeLists.txt file?

[CsatiZoltan]

I managed to set up a minimal example. I will insert the CMakeFile here and edit it from time to time. If you have ideas to make it better, let us discuss it. The idea is to create a robust solution that will hopefully help others as well.

This is a CMake project with a single source file main.cpp, using t8code compiled with VTK and MPI support.
It is assumed that the environment variables T8_INCLUDE and T8_LIB are set to the path of the t8code header files and libraries.
I was inspired by the examples provided in this comment.

cmake_minimum_required(VERSION 3.12.0)
project(project VERSION 0.1.0 LANGUAGES C CXX)

# If t8code was build with MPI support and linked with VTK
find_package(MPI REQUIRED)
find_package(VTK REQUIRED)

include_directories($ENV{T8_INCLUDE})
link_directories($ENV{T8_LIB})

add_executable(project main.cpp)

target_link_libraries(project MPI::MPI_C)
target_link_libraries(project sc p4est t8)

Remarks:

1. CMake recommends lower case command names, e.g. include_directories instead of INCLUDE_DIRECTORIES.
2. I increased the minimum CMake version number to be able to use find_package(VTK).
3. If you want to use this CMakeFile from Visual Studio Code, install the CMake Tools extension, and update your settings.json file with the following setting:

   "cmake.environment": {
       "VTK_DIR": "<path_to_vtk-config.cmake>",
       "T8_INCLUDE": "<same_path_as_defined_in_the_environment_variable_above>",
       "T8_LIB": "<same_path_as_defined_in_the_environment_variable_above>"
   }
   

   where VTK_DIR needs to be given only if find_package(VTK) fails.

[jmark]

https://github.com/DLR-AMR/png2mesh/blob/main/CMakeLists.txt
https://github.com/DLR-AMR/mesh2tikz/blob/main/CMakeLists.txt